Study On Flange Slab Of Comb-type Csisson And Wharf Slab

As a new type of breakwater, the comb-type caisson is characterized with low cost, wave absorption and permeation which has huge potentiality of development and wide application. This paper is researched in coordination with esearch of new types of deepwater breakwater a subproject of the ey techniques and demonstration projects for deepwater pivotal port a major project of the State Ninth Five Year Plan. Combined with the design and construction of the breakwater for Dayaowan Port of Dalian whose main part is comb-type caisson for the first time, the mechanical properties of flange slabs of comb-type caisson and slabs of wharf are studied in this paper. It consists of: 1. Based on the mechanical properties and the model test of the flange slab, the mechanical model is established and the wave action is calculated. The linear elastic analysis is conducted. The reinforcement design of flange slab with three different boundary conditions is presented based on the internal force distribution. 2. Simplified methods are suggested about the influence of the fatigue. The natural vibration characteristic of flange slab is analyzed as well. By finite element method, the frequency-thick parameters of different mode shape are determined. The relationships between the frequency-thick parameter and length to width ratio, thick to width ratio, mode of vibration are studied. The practical formula for calculating the natural vibration period is proposed by correcting the result obtained by thin plate theory. 3. The mechanical problems that need to be solved for the nonlinear analysis of flange slab on the comb-type caisson are discussed, such as the element type of flange slab, nonlinear constitutive relationshipsPH.D. Dissertation of Dalian University of Technology and failure criterion of concrete and steel, cracking and crushing of concrete, method of solving nonlinear FEM equation. The examples of calculation show that the theory and related program are advisable and reliable. The nonlinear analysis of the flange slab with different boundary conditions is conducted and the development and distribution of the crack is also studied. 4. By three dimensional linear-elastic finite element method, the submodel for the connection area between flange slab, caisson and crest wall is established while the comb-type caisson is taken as the integral model. It is shown that the computational scale is reduced and the efficiency of computation is increased. According with the linear and nonlinear analysis, the distribution of the stress concentration and the developemnt of the carck on the flange slab are studied. Thus the suggestion on the reinforcement of connection area is proposed. 5. Based on the experiment, the two-way bending effect on reinforced concrete slabs under concentrated loads is analyzed. To calculate the transverse and the longitudinal moments with two free edges and two fixed edges under the load acting on the longitudinal axis of the slab, the analytical solutions by the reciprocal theorem subjected to partially distributed load and the simplified formula by FEM subjected to concentrated load are presented. 6. The macro file generated by SAP and ANSYS could be controlled aided with the tools of FORTRAN, AUTOLISP and DOS. On the basis of it, a method to execute the computing of FEM continuously and automatically solving the same kinds of mec...